<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
  <style>
    body{
      background-image:url('../CSS3/img/100.png');
      background-repeat:no-repeat;
      background-size:cover;
    }
  </style>
</head>
<body>

</body>
</html>